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Carbon Monoxide is gas just like air. Even it’s physical properties are very close to that of air at room temperature. In the house it easily mixes with air, and this is how it spreads from the source through the entire house. If the forced air furnace is running, Carbon Monoxide will get through the ductwork into every room in no time.

Carbon Monoxide is a product of combustion. No combustion, no Carbon Monoxide. Period.  If you do have Carbon Monoxide in the house, start looking what combustion process spilled its nasty products into the house.
Carbon Monoxide Sources

What is Carbon Monoxide

Carbon Monoxide is just a gas
Products of combustion, also called exhaust or flue products, may come from gas burning home appliances like gas furnace, gas hot water heater, gas oven. They may come from the outside just as well.
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More on Carbon Monoxide

There are few posts on the subject in an attempt to organize the material:


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What is Carbon Monoxide

A Wrong Question About Carbon Monoxide

Where Carbon Monoxide come from

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Finding the Source of Carbon Monoxide in your home

Carbon Monoxide is measured in PPM - Parts Per Million. That is how many parts of CO is contained in 1,000,000 parts of air.

Outdoor levels of less than 1 ppm have been measured in rural areas, and levels as high as 50 ppm have been found in urban areas, although levels of 1 to 10 ppm are more typical.

Normally, indoor levels of CO follow outdoor levels except in houses with unvented or poorly vented combustion appliances or where there is tobacco smoking. Carbon monoxide levels of approximately 100 ppm have been found in the kitchens of some houses immediately after gas stoves were used for cooking.